Question

When GFR decreases, lungs secrete ___________ in renin--angiotensin mechanism.

• A. angiotensin II
• B. angiotensinogen
• C. renin
• D. angiotensin converting enzyme

Hint:

{ACE is secreted by lungs} in the RAAS pathway.

Answer 1

The Correct Option is D

Step 1: Understanding RAAS mechanism.
A decrease in GFR activates the renin–angiotensin–aldosterone system (RAAS) to regulate blood pressure.
Step 2: Role of lungs.
Lungs secrete angiotensin converting enzyme (ACE), which converts angiotensin I into angiotensin II.
Step 3: Physiological effect.
Angiotensin II causes vasoconstriction and increases blood pressure, thereby restoring GFR.